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Environmental Impact Study of Artisanal Mining of Opal in Delanta Woreda

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dc.contributor.advisor Getaneh, Worash(PhD)
dc.contributor.author Shikur, Mohammed
dc.date.accessioned 2018-07-05T11:24:33Z
dc.date.available 2018-07-05T11:24:33Z
dc.date.issued 2011-07
dc.identifier.uri http://etd.aau.edu.et/handle/123456789/6670
dc.description.abstract The study area is found in northern Ethiopia in Amhara region in south Wollo zone Delanta woreda. The area is covered by various kinds of volcanic rocks and the places of the study area include mining sites: Echage, Tache Amba, Minychil and Gengena. The main objective of the research is to assess the environmental and socio-economic impact of unorganized/informal opal mining on the local environment. Moreover, the research aims to generate baseline environmental data for the future comparison of environmental changes which will represent from the mining activities. To achieve the research objectives, samples of waste rocks, soil and water were collected from the mining places for heavy metal analysis by using flame AAS test method and water quality, pH and electrical conductivity (EC) were measured on the site. The survey as well as questionnaires and interviews were conducted. The data were treated with the help of statistical techniques of SPSS v15 and Excel. With the help of geographic information systems (GIS) technique, digital elevation model (DEM) and satellite image the land use /land cover maps of the woreda were indicated. Furthermore the soil loss of the study area was estimated using empirical model of USLE model. The following analytical results (ppm) are obtained from waste rock samples. copper(4-8), zinc( 99-140),cobalt(10-17),nickel(2-8),and lead(<1-10);surface waters(mg/l) all tested heavy metals(cobalt, nickel, copper, zinc , lead and iron) have a result of <0.1which is below the detection limit ;soil(mg/l) cobalt(11-20), nickel (11-18), copper (7-20), zinc (85-141) and lead (3-10 ). Zinc has the highest mean concentration in waste rock and soil samples. The values of the physico-chemical parameters of surface waters of the area are: temperature, 12.1-16.2 0C, electrical conductivity (EC) at 250C, 68.4-74.0μS/cm, and pH, 6.6-7.6. The surface water samples are neutral. The results with respect to heavy metals in water are within the maximum allowable concentration (MAC) of World Health Organization (WHO) and the 2001 Ethiopian Standards for drinking water. The socio economic study results reveal that 91.3 % of the respondents are aware of the problems of opal mining and its impact on the environment like soil erosion that the problem had increased in recent years. Above 48.9 % of the respondents reported that death and injury are the major problems due to collapse of rock in the mining sites. The overall output from the research showed that appropriate guideline is not in practice so as reduce the causalities. The estimated soil loss in the site area of Tsehay Mewocha and the surrounding kebeles was 1,320,000 tons per year from 22900 hectare. These results will definitely serve as a base line for any decision making on the future large sale planning for the mining activities in the area. Key Words: Environmental Impact, Opal, Mining, Delanta, en_US
dc.language.iso en en_US
dc.publisher Addis Ababa University en_US
dc.subject Environmental Impact en_US
dc.subject Opa en_US
dc.subject Mining en_US
dc.subject Delanta en_US
dc.title Environmental Impact Study of Artisanal Mining of Opal in Delanta Woreda en_US
dc.type Thesis en_US


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